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A variable power divider to be 3:1 and 1:3 power division ratios with the good inputmatching characteristic is proposed and fabricated. The proposed power divider has an ungrounded copper plane under two power-dividing lines. The power-dividing line becomes a microstrip line or a coplanar line based on the operating conditions of the ungrounded copper plane. The fabricated power divider at a center frequency of 1.5GHz stably provides power division ratios of 3.2:1 and 1:3.2, with S11<-20dB over the frequency range 0.97-2.22GHz.

A variable power divider with 1:3 and 3:1 power division ratios